Conditional sum

[novinosrin]

HI @David_Billa  I do not have clue of what is DI studio, however noticing the mention by @MCoopmans  DI uses SQL, you could perhaps attempt to use the SQL solution below in your DI studio. Would the below help?

data have;
input VALUE;
cards;
20
20
20
20
20
;


proc sql;
create view temp as
select *,monotonic() as rn
from have;
create table want as
select sum(b.value) as sum
from temp a left join temp b
on b.rn>=a.rn
group by a.rn;
quit;

[David_Billa]

Great! How to tweak your code so that I don't end up with creating/renaming the variable which holds sum value (VALUE) and also have to group by on three variables?

[novinosrin]

to hold sum value as value, there isn't much to do, except

select sum(b.value) as value

Not sure, what you mean by- and also have to group by on three variables? Do you mean something like

select x,y,z,sum(value) as value


group by a.rn, x,y,z;

[David_Billa]

yes, I want like you mentioned in my previous post but it is not producing the desired Output as it is summing the values from all the observations and then doing  Group by instead sum values only from current observations and do the Group by

[David_Billa]

If you group by row number then you will get the same results as your
source dataset

[novinosrin]

Basically the logic

from temp a left join temp b
on b.rn>=a.rn

accommodates the values for a group. The SQL processor see's the following after the JOIN

rn VALUE brn 
1 20 1 
1 20 2 
1 20 3 
1 20 4 
1 20 5 
2 20 2 
2 20 3 
2 20 4 
2 20 5 
3 20 3 
3 20 4 
3 20 5 
4 20 4 
4 20 5 
5 20 5 

Then the summarization takes place